Method of scoring paper-board.



G. 11. WYMAN. I METHOD OF {SCORING PAPER BOARD. APPLIOATIONFILED JAN. 31. 1911'.

1,000, 1 39, Patented Aug. 8, 1911.

wi /vaadea 1/ a (/0 lilow' 6.9 6 mi 211/ M UNITED STATES PATENT OFFICE.

GEbRGE R. WYMAN, OF EAS'I WALBOLE,'MASSACHUSETTS, ASSIGNOR TO CHARLES S.

BIRD, 0F EAST WALPOLE, MASSACHUSETTS.

METHOD OF SCORING PAPER-BOARD.

- Specification of Letters Patent. Patnted Aflg, 8, 1911,

Application filed January 31, 1911. Serial No. 605,697:

To all whomit may concern:

' secured together by adhesive, that without weakening or breaking said board its bending at an angle is facilitated.

This invention consists in the method of treating the paper board at or as'a preliminary step to the scoring operation as shall hereinafter be more fully described and pointed out in the claims. I

Figures 1, 2, and 3 of the drawing illustrate diagrammatically the several steps preferably used in the improved method of scoring paper board, with cross sectional views showing the product of each of said steps.

Similar characters of reference designate corresponding .parts throughout.

Paper board of the nature herein referred to is formed of a series of superposed layers, strips or sheets of paper secured together by adhesive whereby a structure results which-is found to be particularly adapted for use as a substitute for wood, in the manufacture of packing or protecting cases in which goods may be shipped. One of the advantages of the use of paper board is that, by suitable manipulation, it may be bent at an angle whereby it is possible to manufacture therefrom boxes orcases of rectangular form and having closures all formed from a single piece of the paper board. In order to sotreat the stiff and rigid paper board that it can be bent at an angle it has been customary to score said board in the well known manner of scoring comparatively thin paper. Owing, however, to the thickness of the paperboardand to the presence therein of a considerable amount of dried adhesive it is found that in such scoring the series of layers of paper do not readily accommodate themselves to the shape of-the scoring tools and as a; result,

thick material is bent at such sharp angles some of the paper layers are broken or the I that it is weakened along the lines of the scorings which, ultimately forming the corners of the boxes or cases, should be suiticintly strong to resist the torsional and tearing strains to which said boxes or cases are subjected in the exigencies of use. As a matter of fact it is found that the effect of scoring as heretofore accomplished has been to weaken the material at the scoring approximately ten percent. or more.

In carrying my invention into practice I have for my object the retention of all the inherent strength of the paper board along the lines on which, ultimately, the board is to be bent or flexed and to this end I manipulate such portions prior to the scoring operation, to render the same more soft and flexible, in order that such portions shall readily accommodate themselves to the scoring implements and be shaped thereby without being torn or broken. I

Preferably, apparatus is used in carrying out this method and I have shown diagrammatically in the drawings apparatus particularly adapted for this purpose. As shown therein the manipulation of the paper board is effected by two series of concave and convex rolls 5, 6, and 7, 8. In. the'fi-rst-step, in the operation of this method, the paper board a is passed between rolls 5and 6 with the surface 7), which is ultimately to form the inside wall of the 'boX, next the rolls 5, 5 so that shallow concavities' or channels 0 are formed in said surface Z2 and corresponding convexities d, d are pressed from the surface Z) preferably without diminishing the thickness of the paper board. This paper board, shown in Fig. 1, is now preferably subjected to the second step of the process which consists in passing the material bctween the series of rolls 7 and 8 with the ooncavo-convexities cd, cd in registry with said rolls '7 and 8 whereby the material of said concavo-converitie's is pressed in an opposite direction to form the concavo-convexities ef, ef the material of which, having been bent or pressed in two directions beyond the main body of material, is rendered more elastic and flexible than said comparatively rigid main body. The final step of this method is accomplished by passing the material, prepared as shown in Fig. 2, between a series of scoring devices 9, 9

and 10 whereby the flexible material of the concavo-converities ef is forced or pressed inward by the devices 10, 10 and is shaped between the devices 9, 9 to form the ribs g, 9 having the lines of flexure denoted by the grooves h, h and connected with the main comparatively rigid body of material by the unscored portions of the flexible concavoconvexities e-f.

Practice has demonstrated that, by this method of scoring, the paper board is not broken or weakened along the line of the scoring and, in fact, the subjection of the material thus scored to well known 'tests'for strength used in paper manufacture indicates an increase of strength of approxi- .mately twenty per cent. above that of the unscored material.-

It'is of course obvious that in some cases I may dispense with one of the steps indicated in Figs. 1 and 2 of the drawing with out departing from the spirit of this invention.

Having thus described my invention I claim as new and desire to secure by Letters Patent.

1. That method of scoring paper board which consists in flexing a strip of the body of the material back and forth to soften the same andsubsequently scoring said softened portion to form a crease extending inward from that surface of the material toward which the material is eventually to be permanently flexed.

2. That method of scoring paper board which consists in forming a concavo-convex strip in said material and subsequently soon ing the concave portion of said strip, substantially as described.

3. That method of scoring paper board which consists in flexing a strip of the body of material back and forth to soften the same and subsequently scoring said softened portion. r

4. That methodof scoring paperboard which consists in forming aconcavo-convex strip therein, then pressing said stripin'the opposite direction, and subsequentlyscoring said strip at its concave side and forming a rib along its convex side, substantially as described.

GEORGE R. VYDIAN.

Witnesses I M. M. Burns, JAS. H. KIVLIN. 

